Speed-controller for vertical hydraulic machines.



- No. 674,889. Patented May 28. 19m.

1. H. vzrm.

SPEED CQNTRULLER FDR VERTICAL HYDRAULIC MACHINES.

(Application filed Feb. 10, 1898.]

'(No Model.) 2 Shaats-Sheet l.

' Q Wtu emcm I I H 2W a 5 l m m: nonms Pnsa: 00.. PHOTO-H1140 WASHINGTONn. c.

No. 674,889. Patented May 28, 190i. l. H. VENN.

SPEED CONTROLLER FOR VERTICAL HYDRAULIC MACHINES.

2 Sheets-Sheet 2.

(No Model.)

..nI| ll 3 11.x 3 A III lTlID STATES PATENT Fries.

ISAAC H. VENN, OF YONKERS, NEW YORK, ASSIGNOR, BY MESNE ASSIGN- MENTS,TO THE OTIS ELEVATOR COMPANY, OF EAST ORANGE, NEW

JERSEY.

SPEED-CONTROLLER FOR VERTICAL HYDRAULIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 674,889, dated'May 28,1901.

Application filed February 10, 1898. Serial No. 669,829. (No model.)

To all whont it ntcty concern.-

Be it known that I, ISAAC ILVENN, a citizen of'the United States,residing at Yonkers, in the county of WVestchester and State of NewYork, have invented certain new and useful Improvements inSpeed-Controllers for Vertical Hydraulic Machines, of which thefollowing is a specification.

My invention has for its object to prevent the piston of a hydraulicmotor of any kind from obtaining an undue speed; and to this end myinvention consists in providing a selfacting valve arranged in the lineof flow of the fluid to or from or to and from the cylinder and soconstructed as to maintain its normal position, permitting a free flowof the liquid so long as the latter moves at its normal speed, but so asto gradually close and throttle the flow when the movement of the latterbecomes excessive, as fully set forth hereinafter and as illustrated inthe accompanying drawings, in which- Figure 1 illustrates my inventionin, connection with a hydraulic elevator apparatus. Fig. 2 is a planview of the parts shown in Fig. 1; and Fig. 3 is an enlargedlongitudinal section of the valve-casing, valve, and appurtenances.

A indicates the cylinder of a hydraulic elevator, press, or other likeapparatus to be controlled, provided with the usual piston B, connectedwith the cage or platform through any suitable connections, and 0indicates the supply and circulating pipe, communieating at the upperend with the usual supply-inlet of the cylinder and at the lower endwith the discharge port or outlet. In the case of an elevator apparatusof ordinary construction the said supply-pipe extends to a control-valvecasing D, which also communicates with the bottom of the cylinder A andwith a discharge-pipe E, so that water entering through a pipe F underpressure may pass to the pipe 0 and to the cylinder to depress thepiston and lift the cage, or the water may circulate from the top of thepiston, as the latter rises, downward through the pipe 0 to the bottomof the cylinder. The control-valve is of the usual construction to openor cut off the flow from the pipe F upward through the pipe C or permitthe water to circulate from the top to the bottom of the cylinderthrough the pipe O or arrest all flow.

In order that the apparatus regulating, so that the piston may notacquire an undue speed moving in either direction, I make use of aself-acting valve of such character as to be controlled by the stream ofwater, so that in case the water is entering directly to depress thepiston and lift the load or circulating to allow the load to descend itwill be prevented from moving may be selfwith undue rapidity, andconsequently will prevent undue speed in the movement of the partsconnected with the piston. The valve for this purpose may be differentlyconstructed and arranged; but as shown it is Within a casing G, which isenlarged at the center to receive the regulating-valve H,which, asshown, is in the form of a hollow cylinder, having notched, channeled,or otherwise constructed flanges 6 6, adapted to enter the contractedparts 7 9 of the casing, constituting ports at the opposite sides of thecentral enlargement. Thus if the valve rises it will gradually andpartially, but not totally, close the port 7 to reduce the flow of waterto the top of the cyl-' inder, while it the valve descends it willgradually and partially, but not totally, close the port 9 to reduce theflow of Water to the bottom .of the cylinder. The valve should beprovided with means whereby it may be automatically returned to acentral position, which it occupies so long as the water flows in onedirection or the other at its normal rate of speed; but it will permitthe valve to move under the action of the current if the latter becomesexcessive. As shown, the valve is mounted upon a guide-rod I to slidethereon, and against each end bears a spring J, which is coiled around ahollow sleeve 10 on the valve and also around a hollow sleeve 12, whichincloses the rod I and acts as a stop to limit the movement of thevalve. The spring may be compressed to any desired tension by adjustingthe sleeve 'upon the rod I, which may be done by means of a nut 13,which is threaded to turn upon the thread of the rod I.

The springs J are ofsuch a character and so adjusted as to normally holdthe valve in the position shown; but either spring will yieldsufficiently to allow the valve to move in the direction of the currentand gradually throttle without altogether closing the port when thespeed of the current becomes eX- cessive. I

It is desirable to prevent the valve from moving with undue rapidity,which would cause shocks, and I therefore provide a double dash-pot byfitting to the inside of the hollow cylinder of the valve a stationarypacked piston K, which is secured to the rod 1, and providing contractedopenings or channels for the escape of water in either direction. Asshown, these channels so are secured by flattening the opposite faces ofthe rod I, as shown.

A valve operating as described not only serves to automatically regulatethe rapidity of the discharge, but it also is a most elfective safetydevice in case of the overloading of the car, as in such case thepassage of the water from one side of the piston to the other isautomatically so throttled that the car cannot attain an undue speed.

Without limiting myself to the precise construction and arrangement ofparts shown, I claim 1. The combination of a valve-casing havingopposite ports 7, 9, an intermediate valve with ends adapted to saidports, and with an intermediate cylinder to which is fitted a stationarypiston and openings restricting the flow of water to and from thecylinder on opposite sides of the piston, substantially as set forth.

2. The combination ofa double valve,ports, springs, and a stationarypiston upon which the valve moves, and contracted openings permittingthe flow of water from either side of the piston, substantially as setforth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ISAAC H. VENN.

Witnesses:

JAMES WATSON, JOHN J. SPEIGHT.

